Car seats that fit a peugeot 307

Hi I am looking for 3 car seats that I can fit on the back row of my Peugeot 307 5door car? Ideally I would like 3 5point harness ones but would be OK with 2 5 point harness and one high back booster. Does anybody know which car seats would fit? Or advice on where I can go to find out? Thanks x